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                <h2 id="介绍"><a href="#介绍" class="headerlink" title="介绍"></a>介绍</h2><p>The Elastic Stack, 包括 Elasticsearch、Kibana、Beats 和 Logstash（也称为 ELK Stack）。能够安全可靠地获取任何来源、任何格式的数据，然后实时地对数据进行搜索、分析和可视化。Elaticsearch，简称为ES， ES是一个开源的高扩展的分布式全文搜索引擎，是整个Elastic Stack技术栈的核心。它可以近乎实时的存储、检索数据；本身扩展性很好，可以扩展到上百台服务器，处理PB级别的数据。</p>
<span id="more"></span>
<p>目前市面上流行的搜索引擎软件，主流的就两款：Elasticsearch和Solr,这两款都是基于Lucene搭建的，可以独立部署启动的搜索引擎服务软件。由于内核相同，所以两者除了服务器安装、部署、管理、集群以外，对于数据的操作 修改、添加、保存、查询等等都十分类似。</p>
<p><img src="https://pluto-1300780100.cos.ap-nanjing.myqcloud.com/img/image-20220109145455240.png" alt="image-20220109145455240"></p>
<h2 id="Http基本操作"><a href="#Http基本操作" class="headerlink" title="Http基本操作"></a>Http基本操作</h2><h3 id="1-索引"><a href="#1-索引" class="headerlink" title="1.索引"></a>1.索引</h3><ol>
<li><p>创建索引——对比关系型数据库，创建索引就等同于创建数据库</p>
<p>向 ES 服务器发 PUT 请求 <a target="_blank" rel="noopener" href="http://127.0.0.1:9200/shopping，自动创建shopping索引">http://127.0.0.1:9200/shopping，自动创建shopping索引</a></p>
</li>
<li><p>查看所有索引——向 ES 服务器发 GET 请求 <a target="_blank" rel="noopener" href="http://127.0.0.1:9200/_cat/indices?v">http://127.0.0.1:9200/_cat/indices?v</a></p>
<p><img src="https://pluto-1300780100.cos.ap-nanjing.myqcloud.com/img/image-20220109145832063.png" alt="image-20220109145832063"></p>
</li>
<li><p>查看单个索引——向 ES 服务器发 GET 请求 <a target="_blank" rel="noopener" href="http://127.0.0.1:9200/shopping">http://127.0.0.1:9200/shopping</a></p>
</li>
<li><p>删除索引——向 ES 服务器发 DELETE 请求 <a target="_blank" rel="noopener" href="http://127.0.0.1:9200/shopping">http://127.0.0.1:9200/shopping</a></p>
</li>
</ol>
<h3 id="2-文档"><a href="#2-文档" class="headerlink" title="2.文档"></a>2.文档</h3><ol>
<li><p>创建文档——索引已经创建好了，接下来我们来创建文档，并添加数据。这里的文档可以类比为关系型数<br>据库中的表数据，添加的数据格式为 JSON 格式</p>
<p>向 ES 服务器发 POST 请求 <a target="_blank" rel="noopener" href="http://127.0.0.1:9200/shopping/_doc，并在请求体中放入如下json字符">http://127.0.0.1:9200/shopping/_doc，并在请求体中放入如下json字符</a></p>
<pre class="line-numbers language-json" data-language="json"><code class="language-json">{
    "title":"小米手机",
    "category":"小米",
    "images":"http://www.gulixueyuan.com/xm.jpg",
    "price":3999.00
}<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>上面的数据创建后，由于没有指定数据唯一性标识（ID ），默认情况下 ES 服务器会随机生成一个 。<br>如果想要自定义唯一性标识，需要在创建时指定<a target="_blank" rel="noopener" href="http://127.0.0.1:9200/shopping/_doc/1001">http://127.0.0.1:9200/shopping/_doc/1001</a></p>
</li>
<li><p>查看文档——向 ES 服务器发 GET 请求 <a target="_blank" rel="noopener" href="http://127.0.0.1:9200/shopping/_doc/1001">http://127.0.0.1:9200/shopping/_doc/1001</a></p>
</li>
<li><p>修改文档——和新增文档一样，输入相同的URL 地址请求，如果请求体变化，会将原有的数据内容覆盖</p>
</li>
<li><p>修改字段——修改数据时，也可以只修改某一给条数据的局部信息</p>
<p>向 ES 服务器发 POST 请求 <a target="_blank" rel="noopener" href="http://127.0.0.1:9200/shopping/_update/1001，请求体如下：">http://127.0.0.1:9200/shopping/_update/1001，请求体如下：</a></p>
<pre class="line-numbers language-json" data-language="json"><code class="language-json">{
    "doc":{
         "price":3000.00
    }
}<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>根据唯一性标识，查询文档数据，文档数据已经更新</p>
</li>
<li><p>删除文档——删除一个文档不会立即从磁盘上移除，它只是被标记成已删除（逻辑删除）。向 ES 服务器发 DELETE 请求 <a target="_blank" rel="noopener" href="http://127.0.0.1:9200/shopping/_doc/1001">http://127.0.0.1:9200/shopping/_doc/1001</a></p>
</li>
<li><p>条件删除文档——一般删除数据都是根据文档的唯一性标识进行删除，实际操作时，也可以根据条件对多条数据进行删除</p>
<p>向ES 服务器发 POST 请求 <a target="_blank" rel="noopener" href="http://127.0.0.1:9200/shopping/_delete_by_query，json请求体如下：">http://127.0.0.1:9200/shopping/_delete_by_query，json请求体如下：</a></p>
<pre class="line-numbers language-json" data-language="json"><code class="language-json">{
    "query":{
        "match":{
            "price":3999.00
        }
    }
}<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
</li>
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<h3 id="3-映射"><a href="#3-映射" class="headerlink" title="3.映射"></a>3.映射</h3><p>有了索引库，等于有了数据库中的database。接下来就需要建索引库( 中的映射了，类似于数据库中的表结构 。创建数据库表需要设置字段名称，类型，长度，约束等；索引库也一样，需要知道这个类型下有哪些字段，每个字段有哪些约束信息，这就叫做映射。</p>
<ol>
<li><p>创建映射——向 ES 服务器发 PUT 请求 <a target="_blank" rel="noopener" href="http://127.0.0.1:9200/student/_mapping，请求体内容为：">http://127.0.0.1:9200/student/_mapping，请求体内容为：</a></p>
<pre class="line-numbers language-json" data-language="json"><code class="language-json">{
    "properties": {
        "name": {
            "type": "text",
            "index": true
        },
        "sex": {
            "type" :"text",
            "index": false
        },
        "age": {
            "type":"1ong",
            "index": false
        }
    }
}
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>映射数据说明：</p>
<ul>
<li><p>字段名：任意填写，下面指定许多属性，例如： title 、 subtitle 、 images 、 price</p>
</li>
<li><p>type ：类型 Elasticsearch 中支持的数据类型非常丰富，说几个关键的：</p>
<p>text：可分词</p>
<p>keyword：不可分词，数据会作为完整字段进行匹配</p>
<p>Date ：日期类型</p>
<p>Array ：数组类型</p>
</li>
<li><p>index ：是否索引，默认为 true ，也就是说你不进行任何配置，所有字段都会被索引。</p>
<p>true：字段会被索引，则可以用来进行搜索</p>
<p>false：字段不会被索引，不能用来搜索</p>
</li>
</ul>
</li>
<li><p>查看映射——向 ES 服务器发 GET 请求 <a target="_blank" rel="noopener" href="http://127.0.0.1:9200/student/_mapping">http://127.0.0.1:9200/student/_mapping</a></p>
</li>
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<h2 id="JavaAPI"><a href="#JavaAPI" class="headerlink" title="JavaAPI"></a>JavaAPI</h2><h3 id="1-索引-1"><a href="#1-索引-1" class="headerlink" title="1.索引"></a>1.索引</h3><p>连接客户端</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java">//连接es服务器
RestHighLevelClient esClient = new RestHighLevelClient(
    RestClient.builder(new HttpHost("localhost", 9200, "http"))
);
esClient.close();<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>创建索引</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java">CreateIndexRequest request = new CreateIndexRequest("user");
CreateIndexResponse response = esClient.indices().create(request, RequestOptions.DEFAULT);
System.out.println(response.isAcknowledged());<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>
<p>查询索引</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java">GetIndexRequest request = new GetIndexRequest("user");
GetIndexResponse response = esClient.indices().get(request, RequestOptions.DEFAULT);
System.out.println(response.getAliases());
System.out.println(response.getMappings());
System.out.println(response.getIndices());<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>删除索引</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java">// 删除索引 请求对象
DeleteIndexRequest request = new DeleteIndexRequest("user");
// 发送请求，获取响应
AcknowledgedResponse response = client.indices().delete(request,RequestOptions.DEFAULT);<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>
<h3 id="2-文档-1"><a href="#2-文档-1" class="headerlink" title="2.文档"></a>2.文档</h3><p>新增文档</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java">IndexRequest request = new IndexRequest();
request.index("user").id("1001");
User user = new User();
user.setAge(20);
user.setName("JY");
user.setSex("male");
//转化为JSON格式
ObjectMapper mapper = new ObjectMapper();
String s = mapper.writeValueAsString(user);
request.source(s, XContentType.JSON);
IndexResponse response = esClient.index(request, RequestOptions.DEFAULT);

System.out.println(response.getResult());<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>修改文档</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java">UpdateRequest request = new UpdateRequest();
request.index("user").id("1001");
request.doc(XContentType.JSON,"sex","female");
UpdateResponse response = esClient.update(request, RequestOptions.DEFAULT);
System.out.println(response.getResult());<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>查询文档</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java">GetRequest requset = new GetRequest();
requset.index("user").id("1001");
GetResponse response = esClient.get(requset, RequestOptions.DEFAULT);
System.out.println(response.getSourceAsString());<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>
<p>删除文档</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java">DeleteRequest request = new DeleteRequest().index("user").id("1");
DeleteResponse response = client.delete(request, RequestOptions.DEFAULT);
System.out.println(response.toString());<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>
<p>批量操作</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java">创建批量新增请求对象
BulkRequest requ est = new BulkRequest();
request.add(newIndexRequest().index("user").id("1001").source(XContentType.JSON, "name","JY"));
request.add(newIndexRequest().index("user").id("1002").source(XContentType.JSON, "name","LL"));
request.add(newIndexRequest().index("user").id("1003").source(XContentType.JSON, "name","KK"));
BulkResponse responses = client.bulk(request, RequestOptions.DEFAULT);<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h3 id="3-高级查询"><a href="#3-高级查询" class="headerlink" title="3.高级查询"></a>3.高级查询</h3><h4 id="3-1查询全部数据"><a href="#3-1查询全部数据" class="headerlink" title="3.1查询全部数据"></a>3.1查询全部数据</h4><pre class="line-numbers language-java" data-language="java"><code class="language-java">SearchRequest request = new SearchRequest();
request.indices("user");

request.source(new SearchSourceBuilder().query(QueryBuilders.matchAllQuery()));

SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);

SearchHits hits =  response.getHits();

System.out.println(hits.getTotalHits());
System.out.println(response.getTook());

for ( SearchHit hit : hits ) {
    System.out.println(hit.getSourceAsString());
}<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h4 id="3-2条件查询"><a href="#3-2条件查询" class="headerlink" title="3.2条件查询"></a>3.2条件查询</h4><pre class="line-numbers language-java" data-language="java"><code class="language-java">SearchRequest request = new SearchRequest();
request.indices("user");

request.source(new SearchSourceBuilder().query(QueryBuilders.termQuery("age", 30)));
SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);

SearchHits hits = response.getHits();

System.out.println(hits.getTotalHits());
System.out.println(response.getTook());

for ( SearchHit hit : hits ) {
    System.out.println(hit.getSourceAsString());
}<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h4 id="3-3分页查询"><a href="#3-3分页查询" class="headerlink" title="3.3分页查询"></a>3.3分页查询</h4><pre class="line-numbers language-java" data-language="java"><code class="language-java">SearchRequest request = new SearchRequest();
request.indices("user");

SearchSourceBuilder builder = new SearchSourceBuilder().query(QueryBuilders.matchAllQuery());
// (当前页码-1)*每页显示数据条数
builder.from(2);
builder.size(2);
request.source(builder);
SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h4 id="3-4查询排序"><a href="#3-4查询排序" class="headerlink" title="3.4查询排序"></a>3.4查询排序</h4><pre class="line-numbers language-java" data-language="java"><code class="language-java">SearchRequest request = new SearchRequest();
request.indices("user");

SearchSourceBuilder builder = new SearchSourceBuilder().query(QueryBuilders.matchAllQuery());
builder.sort("age", SortOrder.DESC);

request.source(builder);
SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h4 id="3-5过滤字段"><a href="#3-5过滤字段" class="headerlink" title="3.5过滤字段"></a>3.5过滤字段</h4><pre class="line-numbers language-java" data-language="java"><code class="language-java">SearchRequest request = new SearchRequest();
request.indices("user");

SearchSourceBuilder builder = new SearchSourceBuilder().query(QueryBuilders.matchAllQuery());
String[] excludes = {"age"};
String[] includes = {};
builder.fetchSource(includes, excludes);

request.source(builder);
SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h4 id="3-6组合查询"><a href="#3-6组合查询" class="headerlink" title="3.6组合查询"></a>3.6组合查询</h4><pre class="line-numbers language-java" data-language="java"><code class="language-java">SearchRequest request = new SearchRequest();
request.indices("user");

SearchSourceBuilder builder = new SearchSourceBuilder();
BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();

//boolQueryBuilder.must(QueryBuilders.matchQuery("age", 30));
//boolQueryBuilder.must(QueryBuilders.matchQuery("sex", "男"));
//boolQueryBuilder.mustNot(QueryBuilders.matchQuery("sex", "男"));
boolQueryBuilder.should(QueryBuilders.matchQuery("age", 30));
boolQueryBuilder.should(QueryBuilders.matchQuery("age", 40));

builder.query(boolQueryBuilder);

request.source(builder);
SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h4 id="3-7范围查询"><a href="#3-7范围查询" class="headerlink" title="3.7范围查询"></a>3.7范围查询</h4><pre class="line-numbers language-java" data-language="java"><code class="language-java">SearchRequest request = new SearchRequest();
request.indices("user");

SearchSourceBuilder builder = new SearchSourceBuilder();
RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("age");

rangeQuery.gte(30);
rangeQuery.lt(50);

builder.query(rangeQuery);

request.source(builder);
SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h4 id="3-8模糊查询"><a href="#3-8模糊查询" class="headerlink" title="3.8模糊查询"></a>3.8模糊查询</h4><pre class="line-numbers language-java" data-language="java"><code class="language-java">SearchRequest request = new SearchRequest();
request.indices("user");

SearchSourceBuilder builder = new SearchSourceBuilder();
builder.query(QueryBuilders.fuzzyQuery("name", "wangwu").fuzziness(Fuzziness.TWO));//误差在两个字符以内

request.source(builder);
SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h4 id="3-9高亮查询"><a href="#3-9高亮查询" class="headerlink" title="3.9高亮查询"></a>3.9高亮查询</h4><pre class="line-numbers language-java" data-language="java"><code class="language-java">SearchRequest request = new SearchRequest();
request.indices("user");

SearchSourceBuilder builder = new SearchSourceBuilder();
TermsQueryBuilder termsQueryBuilder = QueryBuilders.termsQuery("name", "zhangsan");

HighlightBuilder highlightBuilder = new HighlightBuilder();
highlightBuilder.preTags("&lt;font color='red'&gt;");
highlightBuilder.postTags("&lt;/font&gt;");
highlightBuilder.field("name");

builder.highlighter(highlightBuilder);
builder.query(termsQueryBuilder);

request.source(builder);
SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h4 id="3-10聚合查询"><a href="#3-10聚合查询" class="headerlink" title="3.10聚合查询"></a>3.10聚合查询</h4><pre class="line-numbers language-java" data-language="java"><code class="language-java">SearchRequest request = new SearchRequest();
request.indices("user");

SearchSourceBuilder builder = new SearchSourceBuilder();

AggregationBuilder aggregationBuilder = AggregationBuilders.max("maxAge").field("age");//最大年龄
builder.aggregation(aggregationBuilder);

request.source(builder);
SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h4 id="3-11分组查询"><a href="#3-11分组查询" class="headerlink" title="3.11分组查询"></a>3.11分组查询</h4><pre class="line-numbers language-java" data-language="java"><code class="language-java">SearchRequest request = new SearchRequest();
request.indices("user");

SearchSourceBuilder builder = new SearchSourceBuilder();

AggregationBuilder aggregationBuilder = AggregationBuilders.terms("ageGroup").field("age");
builder.aggregation(aggregationBuilder);

request.source(builder);
SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h2 id="结语"><a href="#结语" class="headerlink" title="结语"></a>结语</h2><p>这里只是总结了ElasticSearch的http操作和JavaAPI的使用，算是入门了。个人建议JavaAPI过一遍有个印象就行，用到直接百度搜。</p>
<p>进阶版的集群和优化现在打算不搞，以后碰到了再学吧😂我现在菜的很，专挑最拉的学一点。</p>

                
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